So what is the real issue here? The State of Hawaii says they have it, but they can't "produce" it, meaning that they can't legally pull it out and show it? Are people allowed to see it? "Eyes only"? It's a bit trite, but maybe if someone said "Look, it does exist, and if you don't believe me you can fly to Hawaii and see it for yourself" we might even get somewhere.
But if someone says "We have it, it exists, but we can't show it to you, so you'll just have to take our word on it" then I guess I can understand people being suspicious.
That only leaves the problem that it never should've been an issue in the first place. Just some racists grasping at straws. Seriously, when was the last time anyone demanded to see the birth certificate of a white president (which obviously means every one before Obama)?